This gets asked a lot, it kind of sucks how it's not implemented since I feel this can heavily benefit all servers. Gollux does have some end-game gear with 2-pieces being bought and 2 being dropped. The ones that are dropped by the heart itself are replaceable, so I don't understand why the others aren't reobtainable as well. I mean, they could also add it to the drop table to the heart itself, which would just be another factor of RNG.
I agree on this as well, I personally don't know if Nexon has made any public stance on why or how this is not a thing yet, at least I haven't been able to find anything. I feel like every time this topic gets brought up, they completely ignore it and push this aside as it's not an issue. If this were to be something implemented on normal servers, I can see this completely decimate the market for those items, making them not worthless but extremely cheap. However, in a way, I feel like Gollux is at a point where it should also be in the same boat as Chaos Root Abyss.
I'm pretty certain TMS was the first server to have Gollux, which makes sense why they don't easy replacements there since they can protect on SF up until 24*'s or something along those lines. However, this is not the case in GMS on any server, only difference is people on regular servers who have enough money can just buy replacements, reboot itself is pretty much capped or YOLO it and hope for the best.
On another note, why not also make it so PNO pres are repeatable so people can obtain another Ring, Belt and/or Shoulder when completing all 3 again?